NPR

It's Summer, And That Means The Mysterious Return Of Glacier Ice Worms

On mountaintop glaciers of Alaska, Washington and Oregon, billions of tiny black worms are tunneling upward, to the barren, icy surface. What lures them, and how do they survive the frozen depths?
Though they're called "ice worms," the creatures Scott Hotaling (right) and his colleagues study on the glaciers of Mt. Rainier can't handle even the slightest bit of freezing. If temperatures dip even slightly below zero degrees Celsius (32 degrees Fahrenheit), Hotaling says, the worms die.

High up on Mount Rainier in Washington, there's a stunning view of the other white-capped peaks in the Cascade Range. But Scott Hotaling is looking down toward his feet, studying the snow-covered ground.

"It's happening," he says, gesturing across the Paradise Glacier.

Small black flecks suddenly appear on the previously blank expanse of white. The glacier's surface quickly transforms as more and more tiny black creatures emerge. The ice worms have returned, snaking in between ice crystals and shimmering in the sun.

Thesethread-like worms, each only about an inch long,wiggle up in the summertime, late in the afternoon, to do — what? Scientists don't know. It's just one of many, which have barely been studied even though they're the most abundant critter living up there in the snow and ice.

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